Tyre What does the z mean ?

MrBlobby

MrBlobby

MrBlobby

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The Z indicates that it is a tyre rated for use on vehicles with a speed capability over 240 KPH (150mph) :)

I think the Z rating is obsolete now as the speed capability is indicated elsewhere anyway. (The Y indicating a maximum speed of 186)
 
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Not quite, ZR indicates it's rated to (from memory) 150mph+ but no more than that, think of it as a class. The other ratings still give you further information and bound the speed rating further. It is a bit obsolete now though as said
 
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The speed rating is in the 91Y section (i.e. Y) in this case, which equates to 186mph. 91 is the load rating. ZR was introduced to reflect the highest speed ever likely to be required which was 150mph+ but without a "max" speed - obviously a lot of cars now are limited to 155mph, but this was a reflection that more cars are now able to achieve those speeds.

Since then W and Y ratings have been introduced which are W 169mph & Y 187mph respectively.
 
Thats essentially what I said/meant. :p

I did read that the ZR rating is obsolete now, but as the tyres wear the newer speed rating figures as well (eg. Y) I don't think that indicates that it "isnt new at all".
 
rodenal said:
Not quite, ZR indicates it's rated to (from memory) 150mph+ but no more than that, think of it as a class. The other ratings still give you further information and bound the speed rating further. It is a bit obsolete now though as said
Click to expand...

The Z means that, the R means Radial :)

The Z as stated means 149mph+

The last letter breaks down the category above 149mph.
 
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